CVE-2025-41724 is a vulnerability identified in Sauter's modulo 6 devices modu680-AS, specifically targeting the wscserver component responsible for handling SOAP requests. The root cause is a failure to properly handle incomplete SOAP elements, classified under CWE-239. An unauthenticated remote attacker can exploit this by sending malformed or incomplete SOAP requests, causing the wscserver process to crash. Unlike typical service crashes that are mitigated by watchdog processes, the wscserver does not automatically restart, resulting in a persistent denial of service until the device is manually rebooted. This vulnerability affects version 0.0.0 of the product, with no patch currently available. The CVSS 3.1 base score of 7.5 reflects a high severity due to the network attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), no confidentiality or integrity impact (C:N/I:N), but high availability impact (A:H). The lack of known exploits in the wild suggests it is either newly discovered or not yet weaponized. However, the potential for operational disruption in environments relying on these devices is significant, especially in industrial control or building automation systems where uptime is critical. The vulnerability highlights the importance of robust input validation and fault tolerance in embedded device communication protocols.

For European organizations, the primary impact of CVE-2025-41724 is a denial of service condition on Sauter modulo 6 devices modu680-AS, which are often used in building automation, HVAC control, and industrial environments. The inability of the wscserver to recover automatically after a crash means that affected devices will remain non-functional until manually rebooted, potentially causing prolonged downtime. This can disrupt critical infrastructure operations, reduce operational efficiency, and increase maintenance costs. Since the attack requires no authentication and can be launched remotely over the network, exposed devices are at significant risk. Confidentiality and integrity are not impacted, but availability degradation can affect safety systems, energy management, and facility operations. European organizations with large deployments of Sauter automation systems, especially in sectors like manufacturing, utilities, and commercial real estate, may face operational and financial consequences. The lack of a patch and the necessity for manual intervention increase the risk window. Additionally, regulatory compliance related to operational continuity and safety may be challenged if devices remain vulnerable and unpatched.

1. Immediately implement network segmentation and access controls to restrict access to the wscserver interface on modulo 6 devices, limiting exposure to trusted management networks only. 2. Deploy firewall rules or intrusion prevention systems to detect and block malformed or incomplete SOAP requests targeting these devices. 3. Monitor device logs and network traffic for abnormal SOAP request patterns indicative of exploitation attempts. 4. Establish operational procedures for rapid manual reboot of affected devices upon detection of service crashes to minimize downtime. 5. Engage with Sauter or authorized vendors to obtain patches or firmware updates as soon as they become available. 6. Consider deploying redundant devices or failover mechanisms to maintain service continuity during potential outages. 7. Conduct regular security assessments and penetration tests focusing on industrial control system protocols and interfaces. 8. Educate operational technology (OT) staff about this vulnerability and the importance of monitoring and incident response readiness. 9. Where possible, disable or restrict SOAP services if not required for device operation. 10. Maintain an inventory of all affected devices and their network exposure to prioritize remediation efforts.